comscore NASA-funded DXL rocket reveals new X-rays from unknown sources
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NASA-funded DXL rocket reveals new X-rays from unknown sources

The DXL rocket was launched in 2012 to study the source of certain X-rays observed near Earth. The X-rays discovered don’t come from any source.

  • Updated: September 25, 2016 9:05 PM IST
space-nasa

Scientists have revealed a new mystery which is an entire group of X-rays that don t come from any source. A NASA-funded sounding rocket to study the origin of X-rays in the universe has helped scientists with the mystery. Some of this invisible light that fills space takes the form of X-rays, the source of which has been hotly contended over the past few decades. The DXL (Diffuse X-ray emission from the Local galaxy) sounding rocket was launched from White Sands Missile Range in New Mexico in 2012 to study the source of certain X-rays observed near Earth. Also Read - High-speed solar storm to hit Earth today, impact phone signals: NASA warns

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In a new study, DXL’s data confirms some of our ideas about where these X-rays come from, thus strengthening our understanding of our solar neighborhood s early history. The two known sources of X-ray emission are the solar wind and the Local Hot Bubble – a theorized area of hot interstellar material that surrounds our solar system. We show that the X-ray contribution from the solar wind charge exchange is about 40 percent in the galactic plane, and even less elsewhere,” said Massimiliano Galeazzi, astrophysicist at University of Miami. So the rest of the X-rays must come from the Local Hot Bubble, proving that it exists, he added.

However, DXL also measured some high-energy X-rays that could not possibly come from the solar wind or the Local Hot Bubble. At higher energies, these sources contribute less than a quarter of the X-ray emission, noted Youaraj Uprety, lead author and astrophysicist at University of Miami at the time the research was conducted. So there’s an unknown source of X-rays in this energy range. We think that around 10 million years ago, a supernova exploded and ionized the gas of the Local Hot Bubble, said Galeazzi. But one supernova wouldn’t be enough to create such a large cavity and reach these temperatures – so it was probably two or three supernova over time, one inside the other.

Identifying the X-ray contribution of the Local Hot Bubble is important for understanding the structure surrounding our solar system, added Uprety who is now astrophysicist at Middle Tennessee State University. It helps us build better models of the interstellar material in our solar neighborhood, the authors noted in a paper published in the Astrophysical Journal. ALSO READ: NASA s Hubble Telescope locates planet orbiting two stars

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  • Published Date: September 25, 2016 9:00 PM IST
  • Updated Date: September 25, 2016 9:05 PM IST



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